It looks like Disney and cohorts have won the case to keep the ‘Sonny Bono Copyright Term Extension Act’ which extended by 20 years both existing copyrights and future copyrights.
From the Eldred v. Ashcroft website.
January 15, 2003 – We have failed in our effort to get the Sonny Bono Act declared unconstitutional.
So, Disney get to keep making money from Mickey for another 20 years and, to paraphrase a line from the eldred site, we won’t be allowed to sing Happy Birthday To You! in public without paying royalty fees!